Biology · Human Health
In the health rule '20-20-20' designed to prevent digital eye strain, what does the final '20' stand for?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Blink the eyes continuously 20 times
- 2Look at an object at least 20 feet away✓
- 3Take a break after 20 hours of work
- 4Look at an object at least 20 meters away
Correct answer
Look at an object at least 20 feet away
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